intel: Expose support for DRI_API_GLES3
intel: Expose support for DRI_API_GLES3

If the hardware/driver combo supports GLES3, then set the GLES3 bit in
intel_screen's bitmask of supported DRI API's.  Neither the EGL nor GLX
layer uses the bit yet.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>
Reviewed-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>

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